MediaExtractor.cpp revision 64a2870d8515fd914638c60803db86dbd92f5b06 
1/*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17//#define LOG_NDEBUG 0
18#define LOG_TAG "MediaExtractor"
19#include <utils/Log.h>
20#include <inttypes.h>
21#include <pwd.h>
22
23#include "include/AMRExtractor.h"
24#include "include/MP3Extractor.h"
25#include "include/MPEG4Extractor.h"
26#include "include/WAVExtractor.h"
27#include "include/OggExtractor.h"
28#include "include/MPEG2PSExtractor.h"
29#include "include/MPEG2TSExtractor.h"
30#include "include/DRMExtractor.h"
31#include "include/WVMExtractor.h"
32#include "include/FLACExtractor.h"
33#include "include/AACExtractor.h"
34#include "include/MidiExtractor.h"
35
36#include "matroska/MatroskaExtractor.h"
37
38#include <binder/IServiceManager.h>
39#include <binder/MemoryDealer.h>
40
41#include <media/stagefright/foundation/ADebug.h>
42#include <media/stagefright/foundation/AMessage.h>
43#include <media/stagefright/DataSource.h>
44#include <media/stagefright/MediaDefs.h>
45#include <media/stagefright/MediaExtractor.h>
46#include <media/stagefright/MetaData.h>
47#include <media/IMediaExtractorService.h>
48#include <cutils/properties.h>
49#include <utils/String8.h>
50#include <private/android_filesystem_config.h>
51
52
53namespace android {
54
55MediaExtractor::MediaExtractor():
56    mIsDrm(false) {
57    if (!LOG_NDEBUG) {
58        uid_t uid = getuid();
59        struct passwd *pw = getpwuid(uid);
60        ALOGI("extractor created in uid: %d (%s)", getuid(), pw->pw_name);
61    }
62
63}
64
65
66sp<MetaData> MediaExtractor::getMetaData() {
67    return new MetaData;
68}
69
70uint32_t MediaExtractor::flags() const {
71    return CAN_SEEK_BACKWARD | CAN_SEEK_FORWARD | CAN_PAUSE | CAN_SEEK;
72}
73
74
75
76class RemoteDataSource : public BnDataSource {
77public:
78    enum {
79        kBufferSize = 64 * 1024,
80    };
81
82    static sp<IDataSource> wrap(const sp<DataSource> &source);
83    virtual ~RemoteDataSource();
84
85    virtual sp<IMemory> getIMemory();
86    virtual ssize_t readAt(off64_t offset, size_t size);
87    virtual status_t getSize(off64_t* size);
88    virtual void close();
89    virtual uint32_t getFlags();
90    virtual String8 toString();
91
92private:
93    sp<IMemory> mMemory;
94    sp<DataSource> mSource;
95    String8 mName;
96    explicit RemoteDataSource(const sp<DataSource> &source);
97    DISALLOW_EVIL_CONSTRUCTORS(RemoteDataSource);
98};
99
100
101sp<IDataSource> RemoteDataSource::wrap(const sp<DataSource> &source) {
102    return new RemoteDataSource(source);
103}
104RemoteDataSource::RemoteDataSource(const sp<DataSource> &source) {
105    mSource = source;
106    sp<MemoryDealer> memoryDealer = new MemoryDealer(kBufferSize, "RemoteDataSource");
107    mMemory = memoryDealer->allocate(kBufferSize);
108    if (mMemory == NULL) {
109        ALOGE("Failed to allocate memory!");
110    }
111    mName = String8::format("RemoteDataSource(%s)", mSource->toString().string());
112}
113RemoteDataSource::~RemoteDataSource() {
114    close();
115}
116sp<IMemory> RemoteDataSource::getIMemory() {
117    return mMemory;
118}
119ssize_t RemoteDataSource::readAt(off64_t offset, size_t size) {
120    ALOGV("readAt(%" PRId64 ", %zu)", offset, size);
121    return mSource->readAt(offset, mMemory->pointer(), size);
122}
123status_t RemoteDataSource::getSize(off64_t* size) {
124    return mSource->getSize(size);
125}
126void RemoteDataSource::close() {
127    mSource = NULL;
128}
129uint32_t RemoteDataSource::getFlags() {
130    return mSource->flags();
131}
132
133String8 RemoteDataSource::toString() {
134    return mName;
135}
136
137// static
138sp<IMediaExtractor> MediaExtractor::Create(
139        const sp<DataSource> &source, const char *mime) {
140    ALOGV("MediaExtractor::Create %s", mime);
141
142    char value[PROPERTY_VALUE_MAX];
143    if (property_get("media.stagefright.extractremote", value, NULL)
144            && (!strcmp("0", value) || !strcasecmp("false", value))) {
145        // local extractor
146        ALOGW("creating media extractor in calling process");
147        return CreateFromService(source, mime);
148    } else {
149        // remote extractor
150        ALOGV("get service manager");
151        sp<IBinder> binder = defaultServiceManager()->getService(String16("media.extractor"));
152
153        // Check if it's WVM, since WVMExtractor needs to be created in the media server process,
154        // not the extractor process.
155        String8 mime8;
156        float confidence;
157        sp<AMessage> meta;
158        if (SniffWVM(source, &mime8, &confidence, &meta) &&
159                !strcasecmp(mime8, MEDIA_MIMETYPE_CONTAINER_WVM)) {
160            return new WVMExtractor(source);
161        }
162
163        if (binder != 0) {
164            sp<IMediaExtractorService> mediaExService(interface_cast<IMediaExtractorService>(binder));
165            sp<IMediaExtractor> ex = mediaExService->makeExtractor(RemoteDataSource::wrap(source), mime);
166            return ex;
167        } else {
168            ALOGE("extractor service not running");
169            return NULL;
170        }
171    }
172    return NULL;
173}
174
175sp<MediaExtractor> MediaExtractor::CreateFromService(
176        const sp<DataSource> &source, const char *mime) {
177
178    ALOGV("MediaExtractor::CreateFromService %s", mime);
179    DataSource::RegisterDefaultSniffers();
180
181    sp<AMessage> meta;
182
183    String8 tmp;
184    if (mime == NULL) {
185        float confidence;
186        if (!source->sniff(&tmp, &confidence, &meta)) {
187            ALOGV("FAILED to autodetect media content.");
188
189            return NULL;
190        }
191
192        mime = tmp.string();
193        ALOGV("Autodetected media content as '%s' with confidence %.2f",
194             mime, confidence);
195    }
196
197    bool isDrm = false;
198    // DRM MIME type syntax is "drm+type+original" where
199    // type is "es_based" or "container_based" and
200    // original is the content's cleartext MIME type
201    if (!strncmp(mime, "drm+", 4)) {
202        const char *originalMime = strchr(mime+4, '+');
203        if (originalMime == NULL) {
204            // second + not found
205            return NULL;
206        }
207        ++originalMime;
208        if (!strncmp(mime, "drm+es_based+", 13)) {
209            // DRMExtractor sets container metadata kKeyIsDRM to 1
210            return new DRMExtractor(source, originalMime);
211        } else if (!strncmp(mime, "drm+container_based+", 20)) {
212            mime = originalMime;
213            isDrm = true;
214        } else {
215            return NULL;
216        }
217    }
218
219    MediaExtractor *ret = NULL;
220    if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_MPEG4)
221            || !strcasecmp(mime, "audio/mp4")) {
222        ret = new MPEG4Extractor(source);
223    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_MPEG)) {
224        ret = new MP3Extractor(source, meta);
225    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_NB)
226            || !strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AMR_WB)) {
227        ret = new AMRExtractor(source);
228    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_FLAC)) {
229        ret = new FLACExtractor(source);
230    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_WAV)) {
231        ret = new WAVExtractor(source);
232    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_OGG)) {
233        ret = new OggExtractor(source);
234    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_MATROSKA)) {
235        ret = new MatroskaExtractor(source);
236    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_MPEG2TS)) {
237        ret = new MPEG2TSExtractor(source);
238    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_WVM) && getuid() == AID_MEDIA) {
239        // Return now.  WVExtractor should not have the DrmFlag set in the block below.
240        return new WVMExtractor(source);
241    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AAC_ADTS)) {
242        ret = new AACExtractor(source, meta);
243    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_CONTAINER_MPEG2PS)) {
244        ret = new MPEG2PSExtractor(source);
245    } else if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_MIDI)) {
246        ret = new MidiExtractor(source);
247    }
248
249    if (ret != NULL) {
250       if (isDrm) {
251           ret->setDrmFlag(true);
252       } else {
253           ret->setDrmFlag(false);
254       }
255    }
256
257    return ret;
258}
259
260}  // namespace android
261